Fig. 2.

Group average two-dimensional (2D) slices of the estimated (four-dimensional) third-order kernels (k₃[n₁,n₂,n₃]) in Eq. 2 with the largest (top), second largest (middle), and third largest (bottom) energies. The group averages are illustrated as the mean over the subjects (solid line) and mean ± SE over the subjects (dashed line), whereas energy is defined as the sum of squares of the samples of the kernel slice. The diagonal slice (k₃[n,n,n]) was largest in energy for Wistar-Kyoto (WKY rats during Gaussian white noise CSP stimulation with mean of 120 mmHg), spontaneously hypertensive rats (SHR₁₂₀ during the same CSP stimulation), and SHR₁₆₀ (during the Gaussian white noise CSP stimulation but with mean of 160 mmHg).